Abstract
Various aspects of the reproductive biology of the Andean-disjunct genusRetanilla (DC.) Brongn. were studied in populations ofR. trinervia andR. ephedra located in central Chile and ofR. patagonica in southern Argentina. Flowering extends from -austral- winter (early spring inR. patagonica) to early summer. The small, white, entomophilous flowers are incompletely protandrous and last four to five days. A weak pleasant odor along with nectar and pollen attract thirty-seven diurnal insect species, ten of which are probable pollinators: these include the honey bee, eight species of solitary bees pertaining toAnthophoridae (1 sp.),Colletidae (3 spp.) andHalictidae (4 spp.), and a nemestrinid fly. Although flower morphology and individual flower phenology do not fully prevent self-pollination (and geitonogamy can easily take place), the level of autogamy is low. Therefore, some self-incompatibility mechanism seems operative inRetanilla. Fruit set of open-pollinated flowers is extremely low, with a maximal value of c. 3% inR. patagonica. In this species, ripe fruits contain on average 1.37 viable seeds. Predispersal (maternal) reproductive success (percent ovules becoming viable seeds) is 2.3%. For medium to full-sized individuals this corresponds to c. 4600 potential offspring per year. As presently known,Retanilla is a reproductively uniform group, in which the Andean disjunction seems to have exerted no particular impact, which is consistent with the view that pollination generalization exerts some stabilizing influence on floral morphology and other reproductive traits.Retanilla expresses a basic rhamnacean set of traits (including protandry and self-incompatibility) showing also high pollen production and secondary pollen presentation. The latter two traits seem characteristic of theRetanilla-Trevoa clade, suggesting that a trend to increased male effort and, perhaps, dependence upon polleneating has evolved within the tribe Colletieae.
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References
Aagesen L. (1999) Phylogeny of the tribe Colletieae (Rhamnaceae). Bot. J. Linn. Soc. (in press).
Ackerman W. L. (1961) Flowering, pollination, selfsterility, and seed development of Chinese Jujube. Proc. Amer. Soc. Hort. Sci. 77: 265–269.
Arroyo M. T. K., Squeo F. (1990) Relationship between plant breeding systems and pollination In: Kawano S. (ed.) Biological approaches and evolutionary trends in plants. Academic Press, London, pp. 205–227.
Arroyo M. T. K., Uslar P. (1993) Breeding systems in a temperate mediterranean-type climate montane sclerophyllous forest in central Chile. Bot. J. Linn. Soc. 111: 83–102.
Arroyo M. T. K., Cavieres L., Peñaloza A., Riveros M., Faggi A. M. (1995) Relaciones fitogeográficas y patrones regionales de riqueza de especies en la flora del bosque lluvioso templado de Sudamérica. In: Armesto J. J., Villagrán C., Arroyo M. K. (eds.) Ecología de los bosques nativos de Chile. Editorial Universitaria, Santiago, pp. 71–99.
Beeskow A. M., Del Valle H. F., Rostagno C. M. (1987) Los sistemas fisiográficos de la región árida y semiárida de la provincia del Chubut. SECYT, Puerto Madryn.
Cabrera A. L. (1976) Regiones fitogeográficas Argentinas. In: Kugler W. F. (ed.) Enciclopedia Argentina de agricultura y jardinería 2nd edn, 2(1). ACME, Buenos Aires.
Cruden R. W. (1997) Pollen-ovule ratios: a conservative indicator of breeding systems in flowering plants. Evolution 31: 32–46.
D'Ambrogio A., Medan D. (1993) Comportamiento reproductivo deColletia paradoxa (Rhamnaceae). Darwiniana 32: 1–14.
Di Castri F. (1991) An ecological overview of the five regions of the world with a mediterranean climate. In: Groves R. H., Di Castri F. (eds.) Biogeography of mediterranean invasions. Cambridge University Press, Cambridge, pp. 3–16.
Forcone A., Galetto L., Bernardello L. (1997) Floral nectar composition of some species from Patagonia. Biochem. Syst. Ecol. 25: 395–402.
Galil J., Zeroni M. (1967) On the pollination ofZizyphus spina-christi (L.) Willd. in Israel. Israel J. Botany 16: 71–77.
Guitián P. (1995) Reproductive biology ofRhamnus legionensis Rothm., a dioecious species endemic to the northwest Iberian peninsula. Flora 190: 345–352.
Harvey C. F., Braggins J. E. (1985) Reproduction of the New Zealand taxa ofPomaderris Labill. (Rhamnaceae). New Zealand J. Bot. 23: 151–156.
Herrera J. (1987) Flower and fruit biology in southern Spanish mediterranean shrublands. Ann. Missouri Bot. Gard. 74: 69–78.
Hinojosa L. F., Villagrán C. (1997) Historia de los bosques del sur de Sudamérica, I: antecedentes paleobotánicos, geológicos y climáticos del Terciario del cono sur de América. Revista Chilena Hist. Nat. 70: 225–239.
Hoffmann A. (1972) Morphology and histology ofTrevoa trinervia (Rhamnaceae), a drought deciduous shrub from the Chilean matorral. Flora 161: 527–538.
Keogh J. A., Bannister P. (1993) Transoceanic dispersal in the amphiantarctic genusDiscaria: an evaluation. New Zealand J. Bot. 31: 427–430.
Markgraf V., McGlone M., Hope G. (1995) Neogene paleoenvironmental and paleoclimatic change in southern temperate ecosystems — a southern perspective. Trends Ecol. Evol. 10: 143–147.
Medan D. (1985) Fruit morphogenesis and seed dispersal in the Colletieae (Rhamnaceae). I. The genusDiscaria. Bot. Jahrb. Syst. 105: 205–262.
Medan D. (1991) Reproductive phenology, pollination biology, and gynoecium development inDiscaria americana (Rhamnaceae). New Zealand J. Bot. 29: 31–42.
Medan D. (1993) Breeding system and maternal success of a perennial hermaphrodite,Discaria americana (Rhamnaceae). New Zealand J. Bot. 31: 175–184.
Medan D. (1994) Reproductive biology ofFrangula alnus (Rhamnaceae) in southern Spain. Plant Syst. Evol. 193: 173–186.
Medan D., Aagesen L. (1995) Comparative flower and fruit structure in the Colletieae (Rhamnaceae). Bot. Jahrb. Syst. 117: 531–564.
Medan D., D'Ambrogio A. C. (1998) Reproductive biology of the andromonoecious shrubTrevoa quinquenervia (Rhamnaceae). Bot. J. Linn. Soc. 126: 191–206.
Medan D., Vasellati M. V. (1996) Nonrandom mating inDiscaria americana (Rhamnaceae). Plant Syst. Evol. 201: 233–241 [corrigenda in Plant Syst. Evol. 203: 1–2, 1997].
Mehrotra N. K., Gupta M. F. (1985) Pollination and fruit set studies in ber (Zizyphus mauritiana Lamk.). J. Res. Punjab Agric. Univ. 22: 671–674.
Montenegro G., Riveros F., Alcalde C. (1980) Morphological structure and water balance of four Chilean shrub species. Flora 170: 554–564.
Montenegro G., Segura B., Saenger R., Mujica A. M. (1981) Xeromorfismo en especies arbustivas del matorral chileno. Anales Mus. Hist. Nat. Valparaíso 14: 71–83.
Montenegro G., Teillier S., Arce P., Poblete V. (1991) Introduction of plants into the mediterranean-type climate area of Chile. In: Groves R. H., Di Castri F. (eds.) Biogeography of mediterranean invasions. Cambridge University Press, Cambridge, pp. 103–114.
Mooney H. A., Kummerow J., Chu C., Hays R. I. (1977) Biomass, energy and mineral characteristics. In: Thrower N. J. W., Bradbury D. E. (eds.) Chile-California mediterranean scrub atlas. A comparative analysis. Dowden, Hutchinson and Ross, Stroudsburg, pp. 162–164.
Ollerton J., Lack A. J. (1992) Flowering phenology: an example of relaxation of natural selection? Trends Ecol. Evol. 7: 274–276.
Ollerton J. (1996) Reconciling ecological processes with phylogenetic patterns; the apparent paradox of plant-pollinator systems. J. Ecol. 84: 767–769.
Pérez C., Villagrán C. (1985) Distribución de abundancias de especies en bosques relictos de la zona mediterránea de Chile. Revista Chilena Hist. Nat. 58: 157–170.
Primack R. B. (1979) Reproductive biology ofDiscaria toumatou (Rhamnaceae). New Zealand J. Bot. 17: 9–13.
Rama Devi K., Atluri J. B., Subba Reddi C. (1989) Pollination ecology ofZizyphus mauritiana (Rhamnaceae). Proc. Indian Acad. Sci. (Pl. Sci.) 99: 223–239.
Ramírez N. (1993) Producción y costo de frutosy semillas entre formas de vida. Biotropica 25: 46–60.
Soriano A., Volkheimer W., Walter H., Box O., Marcolin A. A., Vallerini J. A., Movia C. P., León R. J. C., Gallardo J. M., Rumboll M., Canevari P., Vasina W. G. (1983) Deserts and semi-deserts of Patagonia. In: West N. E. (ed.) Temperate deserts and semi-deserts. Elsevier, Amsterdam, pp. 423–460.
Teaotia S. S., Chauhan R. S. (1963) Flowering, pollination, fruit-set and fruit-drop studies in ber (Zizyphus mauritiana Lamk.). I. Floral biology. Punjab J. Hort. 3: 60–70.
Thrower N. J. W., Bradbury D. E. (eds.) (1977) Chile-California mediterranean scrub atlas. A comparative analysis. Dowden, Hutchinson and Ross, Stroudsburg.
Tortosa R. D. (1992) El complejoRetanilla-Talguenea-Trevoa (Rhamnaceae). Darwiniana 31: 223–252.
Tortosa R. D., Aagesen L., Tourn G. M. (1996) Morphological studies in the tribeColletieae (Rhamnaceae): analysis of architecture and inflorescences. Bot. J. Lin. Soc. 122: 353–367.
Villagrán C., Hinojosa L. F. (1997) Historia de los bosques del sur de Sudaméroca. II: Análisis fitogeográfico. Revista Chilena Hist. Nat. 70: 241–267.
Waser N. M. (1998) Pollination, angiosperm speciation, and the nature of species boundaries. Oikos 81: 198–201.
Waser N. M., Chittka L., Price M. V., Williams N. M., Ollerton J. (1996) Generalization in pollination systems, and why it matters. Ecology 77: 1043–1060.
Webb C. J. (1985) Protandry, pollination, and self-incompatibility inDiscaria toumatou. New Zealand J. Bot. 23: 331–335.
Wiens D., Calvin C. L., Wilson C. A., Davern C. I. Frank D., Seavey S. R. (1987) Reproductive success, spontaneous embryo abortion, and genetic load in flowering plants. Oecologia 71: 501–509.
Zietsman P. C., Botha F. C. (1992) Flowering ofZiziphus mucronata subsp.mucronata (Rhamnaceae): anthesis, pollination and protein synthesis. Bot. Bull. Acad. Sin. 33: 33–42.
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Medan, D., Arce, M.E. Reproductive biology of the Andean-disjunct genusRetanilla (Rhamnaceae). Pl Syst Evol 218, 281–298 (1999). https://doi.org/10.1007/BF01089232
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DOI: https://doi.org/10.1007/BF01089232